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Pongcharoen P, Tawong W, Pathaichindachote W, Rod-In W. Physiological responses contributing to multiple stress tolerance in Pichia kudriavzevii with potential enhancement for ethanol fermentation. J Biosci Bioeng 2024:S1389-1723(24)00201-9. [PMID: 39098474 DOI: 10.1016/j.jbiosc.2024.07.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Revised: 06/28/2024] [Accepted: 07/15/2024] [Indexed: 08/06/2024]
Abstract
Economically feasible ethanol production requires efficient hydrolysis of lignocellulosic biomass and high-temperature processing to enable simultaneous saccharification and fermentation. During the lignocellulolysic hydrolysate, the yeast must encounter with a multiple of inhibitors such as heat and furfural. To solve this problem, a potential fermentative yeast strain that tolerated simultaneous multistress and enhance ethanol concentration was investigated. Twenty yeast isolates were classified into two major yeast species, namely Pichia kudriavzevii (twelve isolates) and Candida tropicalis (eight isolates). All P. kudriavzevii isolates were able to grow at high temperature (45 °C) and exhibited stress tolerance toward furfural. Among P. kudriavzevii isolates, NUCG-S3 presented the highest specific growth rate under each stress condition of heat and furfural, and multistress. Morphological changes in P. kudriavzevii isolates (NUCG-S2, NUCG-S3, NUKL-P1, NUKL-P3, and NUOR-J1) showed alteration in mean cell length and width compared to the non-stress condition. Ethanol production by glucose was also determined. The yeast strain, NUCG-S3, gave the highest ethanol concentrations at 99.46 ± 0.82, 62.23 ± 0.96, and 65.80 ± 0.62 g/l (P < 0.05) under temperature of 30 °C, 40 °C, and 42 °C, respectively. The tolerant isolated yeast NUCG-S3 achieved ethanol production of 53.58 ± 3.36 and 48.06 ± 3.31 g/l (P < 0.05) in the presence of 15 mM furfural and multistress (42 °C with 15 mM furfural), respectively. Based on the results of the present study, the novel thermos and furfural-tolerant yeast strain P. kudriavzevii NUCG-S3 showed promise as a highly proficient yeast for high-temperature ethanol fermentation.
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Affiliation(s)
- Pongsanat Pongcharoen
- Department of Agricultural Science, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok 65000, Thailand; Center of Excellence in Research for Agricultural Biotechnology, Naresuan University, Phitsanulok 65000, Thailand.
| | - Wittaya Tawong
- Department of Agricultural Science, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok 65000, Thailand; Center of Excellence in Research for Agricultural Biotechnology, Naresuan University, Phitsanulok 65000, Thailand.
| | - Wanwarang Pathaichindachote
- Department of Agricultural Science, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok 65000, Thailand; Center of Excellence in Research for Agricultural Biotechnology, Naresuan University, Phitsanulok 65000, Thailand.
| | - Weerawan Rod-In
- Department of Agricultural Science, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok 65000, Thailand; Center of Excellence in Research for Agricultural Biotechnology, Naresuan University, Phitsanulok 65000, Thailand.
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Pongcharoen P. The ability of Pichia kudriavzevii to tolerate multiple stresses makes it promising for developing improved bioethanol production processes. Lett Appl Microbiol 2022; 75:36-44. [PMID: 35315114 DOI: 10.1111/lam.13703] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2021] [Revised: 02/17/2022] [Accepted: 03/16/2022] [Indexed: 11/27/2022]
Abstract
Thermotolerant ethanol fermenting yeasts have been extensively used in industrial bioethanol production. However, little is known about yeast physiology under stress during bioethanol processing. This study investigated the physiological characteristics of the thermotolerant yeast Pichia kudriavzevii, strains NUNS-4, NUNS-5 and NUNS-6, under the multiple stresses of heat, ethanol and sodium chloride. Results showed that NUNS-4, NUNS-5 and NUNS-6 displayed higher growth rates under each stress condition than the reference strain, Saccharomyces cerevisiae TISTR5606. Maximum specific growth rates under stresses of heat (45°C), 15% v/v ethanol and 1·0 M sodium chloride were 0·23 ± 0·04 (NUNS-4), 0·11 ± 0·01 (NUNS-5) and 0·15 ± 0·01 h-1 (NUNS-5), respectively. Morphological features of all yeast studied changed distinctly with the production of granules and vacuoles when exposed to ethanol, and cells were elongated under increased sodium chloride concentration. This study suggests that the three P. kudriavzevii strains are potential candidates to use in industrial-scale fermentation due to a high specific growth rate under multiple stress conditions. Multiple stress-tolerant P. kudriavzevii NUNS strains have received much attention not only for improving large-scale fuel ethanol production, but also for utilizing these strains in other biotechnological industries.
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Affiliation(s)
- Pongsanat Pongcharoen
- Department of Agricultural Science, Faculty of Agriculture, Natural Resources and Environment, Naresuan University, Phitsanulok, Thailand.,Center of Excellence in Research in Agricultural Biotechnology, Naresuan University, Phitsanulok, Thailand
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da Silveira FA, Diniz RHS, Sampaio GMS, Brandão RL, da Silveira WB, Castro IM. Sugar transport systems in Kluyveromyces marxianus CCT 7735. Antonie van Leeuwenhoek 2018; 112:211-223. [DOI: 10.1007/s10482-018-1143-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Accepted: 08/11/2018] [Indexed: 11/30/2022]
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Cahill G, Walsh PK, Donnelly D. Improved Control of Brewery Yeast Pitching Using Image Analysis. JOURNAL OF THE AMERICAN SOCIETY OF BREWING CHEMISTS 2018. [DOI: 10.1094/asbcj-57-0072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Gearoid Cahill
- Guinness Research and Development, St James's Gate, Dublin 8, Ireland
| | - Padraig K. Walsh
- School of Biotechnology, Dublin City University, Dublin 9, Ireland
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Bellou S, Makri A, Triantaphyllidou IE, Papanikolaou S, Aggelis G. Morphological and metabolic shifts of Yarrowia lipolytica induced by alteration of the dissolved oxygen concentration in the growth environment. MICROBIOLOGY-SGM 2014; 160:807-817. [PMID: 24509502 DOI: 10.1099/mic.0.074302-0] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Yarrowia lipolytica, an ascomycete with biotechnological potential, is able to form either yeast cells or hyphae and pseudohyphae in response to environmental conditions. This study shows that the morphology of Y. lipolytica, cultivated in batch cultures on hydrophilic (glucose and glycerol) and hydrophobic (olive oil) media, was not affected by the nature of the carbon source, nor by the nature or the concentration of the nitrogen source. By contrast, dissolved oxygen concentration (DOC) should be considered as the major factor affecting yeast morphology. Specifically, when growth occurred at low or zero DOC the mycelial and/or pseudomycelial forms predominated over the yeast form independently of the carbon and nitrogen sources used. Experimental data obtained from a continuous culture of Y. lipolytica on glycerol, being used as carbon and energy source, demonstrated that the mycelium-to-yeast form transition occurs when DOC increases from 0.1 to 1.5 mg l(-1). DOC also affected the yeast physiology, as the activity of enzymes implicated in lipid biosynthesis (i.e. ATP-citrate lyase, malic enzyme) was upregulated at high DOC whereas the activity of enzymes implicated in glycerol assimilation (such as glycerol dehydrogenase and kinase) remained fundamentally unaffected in the cell-free extract.
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Affiliation(s)
- Stamatia Bellou
- Unit of Microbiology, Division of Genetics, Cell and Development Biology, Department of Biology, University of Patras, Patras, Greece
| | - Anna Makri
- Unit of Microbiology, Division of Genetics, Cell and Development Biology, Department of Biology, University of Patras, Patras, Greece
| | - Irene-Eva Triantaphyllidou
- Unit of Microbiology, Division of Genetics, Cell and Development Biology, Department of Biology, University of Patras, Patras, Greece
| | - Seraphim Papanikolaou
- Department of Food Science and Human Nutrition, Agricultural University of Athens, Athens, Greece
| | - George Aggelis
- Department of Biological Sciences, King Abdulaziz University, Jeddah, Saudi Arabia.,Unit of Microbiology, Division of Genetics, Cell and Development Biology, Department of Biology, University of Patras, Patras, Greece
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Pratt PL, Bryce JH, Stewart GG. The Effects of Osmotic Pressure and Ethanol on Yeast Viability and Morphology. JOURNAL OF THE INSTITUTE OF BREWING 2012. [DOI: 10.1002/j.2050-0416.2003.tb00162.x] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Gori K, Knudsen PB, Nielsen KF, Arneborg N, Jespersen L. Alcohol-based quorum sensing plays a role in adhesion and sliding motility of the yeast Debaryomyces hansenii. FEMS Yeast Res 2011; 11:643-52. [DOI: 10.1111/j.1567-1364.2011.00755.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Revised: 09/04/2011] [Accepted: 09/05/2011] [Indexed: 11/30/2022] Open
Affiliation(s)
- Klaus Gori
- Department of Food Science, Food Microbiology; Faculty of Life Sciences; University of Copenhagen; Frederiksberg; Denmark
| | - Peter B. Knudsen
- Department of Systems Biology; Center for Microbial Biotechnology; Technical University of Denmark; Lyngby; Denmark
| | - Kristian F. Nielsen
- Department of Systems Biology; Center for Microbial Biotechnology; Technical University of Denmark; Lyngby; Denmark
| | - Nils Arneborg
- Department of Food Science, Food Microbiology; Faculty of Life Sciences; University of Copenhagen; Frederiksberg; Denmark
| | - Lene Jespersen
- Department of Food Science, Food Microbiology; Faculty of Life Sciences; University of Copenhagen; Frederiksberg; Denmark
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Babitha S, Soccol CR, Pandey A. Effect of stress on growth, pigment production and morphology of Monascus sp. in solid cultures. J Basic Microbiol 2007; 47:118-26. [PMID: 17440913 DOI: 10.1002/jobm.200610261] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The aim of the current work was to study the influence of stress on pigment production in Monascus purpureus under solid-state fermentation. Thermal stress was induced by incubating the culture at various high temperatures. For giving osmotic stress, different concentration of NaCl and glycerol were added to the solid substrate prior to autoclaving. Morphological studies were done by light microscopy and scanning electron microscopy. When the cells were exposed to high temperature, high glycerol and salt concentration, significant changes in pigment production and growth were observed. High temperature (>45 degrees C) induced the production of more yellow pigments. High concentration of NaCl induced conidiation and caused a decrease in fungal biomass (up to 50%) but red pigment production increased from 11.86 OD/gds to 20.14 OD/gds. When subjected to glycerol stress, a significant increase in aerial mycelia was observed when compared with the control conditions. The results attain significance for exploiting the fungal culture of Monascus purpureus LPB 97 for producing colors of choice--red, or yellow, or increasing the yield of red pigments considerably. Thus, these results could well impact the commercial aspect of Monascus pigments for industrial application.
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Affiliation(s)
- Sumathy Babitha
- Biotechnology Division, National Institute for Interdisciplinary Science and Technology, CSIR, Trivandrum, India
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MCCARTHY AA, GILBOY P, WALSH PK, FOLEY G. CHARACTERISATION OF CAKE COMPRESSIBILITY IN DEAD-END MICROFILTRATION OF MICROBIAL SUSPENSIONS. CHEM ENG COMMUN 2007. [DOI: 10.1080/00986449908912777] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- A. A. MCCARTHY
- a School of Biotechnology, Dublin City University , Dublin 9, Ireland
| | - P. GILBOY
- a School of Biotechnology, Dublin City University , Dublin 9, Ireland
| | - P. K. WALSH
- a School of Biotechnology, Dublin City University , Dublin 9, Ireland
| | - G. FOLEY
- a School of Biotechnology, Dublin City University , Dublin 9, Ireland
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Cho EJ, Oh JY, Chang HY, Yun JW. Production of exopolysaccharides by submerged mycelial culture of a mushroom Tremella fuciformis. J Biotechnol 2006; 127:129-40. [PMID: 16872706 DOI: 10.1016/j.jbiotec.2006.06.013] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2006] [Revised: 05/19/2006] [Accepted: 06/22/2006] [Indexed: 11/30/2022]
Abstract
The optimization of submerged culture conditions for mycelial growth and exopolysaccharide (EPS) production in an edible mushroom Tremella fuciformis was studied in shake flasks and bioreactors. The temperature of 28 degrees C and pH 8 in the beginning of fermentation in agitated flasks was the most efficient condition to obtain maximum mycelial biomass and EPS. The optimal medium constituents were as follows (gL(-1)): glucose 20, tryptone 2, KH(2)PO(4) 0.46, K(2)HPO(4) 1 and MgSO(4).7H(2)O 0.5. The fungus was cultivated under various agitation and aeration conditions in a 5L stirred-tank bioreactor. The maximum cell mass and EPS production were obtained at a relatively high agitation speed of 200 rpm and at an aeration rate of 2 vvm. The flow behavior of the fermentation broth was Newtonian and the maximum apparent viscosity (35 cP) was observed at a highly aerated condition (2 vvm). The EPS productivity in an airlift reactor was higher than that in the stirred-tank reactor. The morphological study revealed that the fungus grows in mainly three different yeast-like forms: ovoid, elongated, and double yeast forms. The high population of the elongated yeast has a very close relationship to high EPS production. The EPS were protein-bound polysaccharides consisted of mainly mannose, xylose, and fucose. The molecular weights of EPS were determined to be (1.3-1.5)x10(6).
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Affiliation(s)
- Eun Jae Cho
- Department of Biotechnology, Daegu University, Kyungsan, Kyungbuk 712-714, Republic of Korea
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Monjushiro H, Hatta M, Watarai H. Size sorting of biological micro-particles by Newton-ring nano-gap device. J Chromatogr A 2006; 1106:205-10. [PMID: 16337643 DOI: 10.1016/j.chroma.2005.10.080] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2005] [Revised: 10/27/2005] [Accepted: 10/31/2005] [Indexed: 11/20/2022]
Abstract
The size determination and the size sorting of micrometer-sized particles were carried out by using a piezo-controlled nano-gap. The nano-gap was built by combining a plano-convex lens and a flat glass plate. The fabricated gap had a gradient, while the center of the lens was narrow and the outer side was wide. When the sample solution was injected into the gap, a meniscus force carried the sample particles toward the center of the lens with solvent evaporation; then the individual particle was trapped at the specific position where the particle diameter was equal to the gap distance. The size determination ability of this new method was certified by using the standard polystyrene particles and the size measurements of DNA molecules and yeast cells were demonstrated.
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Affiliation(s)
- Hideaki Monjushiro
- Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan
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Ronen M, Guterman H, Shabtai Y. Monitoring and control of pullulan production using vision sensor. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2002; 51:243-9. [PMID: 12088884 DOI: 10.1016/s0165-022x(01)00182-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The production of the polysaccharide pullulan by the yeast-like fungi, Aureobasidium pullulans, is accompained by cellular morphogenetic changes. High productivity and yield of the process have been found to correlate with high concentration of yeast-like cells in the culture. The morphogenetic changes of A. pullulans cells depend on the culture conditions, e.g., dissolved oxygen, shear rate and medium composition. In order to improve the productivity of the process, a novel control law was formulated. A feeding strategy dependent on the culture cellular composition was designed and aimed to keep the yeast-like cell concentration high. The culture morphogenetic composition during the process was monitored by a recently developed vision sensor. Feeding was actuated when the yeast-like cell concentration decreased below a threshold. The proposed control strategy improved pullulan production by increasing both productivity and yield of the cells by 67% and 80%, correspondingly. The results point to the advantage and the potential of using the monitoring and control system and algorithm to increase productivity and yield in cellular bioprocesses.
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Affiliation(s)
- M Ronen
- Unit of Biotechnology, Faculty of Engineering Sciences, Ben Gurion University of the Negev, P.O. Box 653, 84105, Beer-Sheva, Israel.
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Peña C, Reyes C, Larralde-Corona P, Corkidi G, Galindo E. Characterization of Azotobacter vinelandii aggregation in submerged culture by digital image analysis. FEMS Microbiol Lett 2002; 207:173-7. [PMID: 11958936 DOI: 10.1111/j.1574-6968.2002.tb11047.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
A simple and accurate method for determining the distribution of sizes of single cells and aggregates of Azotobacter vinelandii by image analysis has been developed. A staining procedure using methylene blue helps to enhance the contrast between aggregates and background without altering aggregate size distribution. Sample dilution affected the distribution of the population and therefore should be avoided. Mixing and aeration conditions during culture play an important role in the aggregation of A. vinelandii. Cells grown under mild mixing conditions (unbaffled flasks) presented a thick slime layer and formed aggregates of up to 35 microm of average equivalent diameter. In contrast, under strong agitation conditions (baffled flasks) practically no aggregates were formed throughout cultivation. The method described can be used for the characterization of aggregation of other microbial cultures.
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Affiliation(s)
- Carlos Peña
- Departamento de Bioingeniería, Instituto de Biotecnología, Universidad Nacional Autónoma de México, P.O. Box 510-3, 62250, Morelos, Cuernavaca, Mexico.
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Cahill G, Walsh PK, Donnelly D. Determination of yeast glycogen content by individual cell spectroscopy using image analysis. Biotechnol Bioeng 2000; 69:312-22. [PMID: 10861411 DOI: 10.1002/1097-0290(20000805)69:3<312::aid-bit9>3.0.co;2-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A rapid technique has been developed to determine the glycogen content of yeast on an individual cell basis using a combination of image analysis technology and staining of yeast cells with an I(2):KI solution. Changes in mean cellular glycogen content during alcoholic fermentation have been reported using this technique. The glycogen content of stored brewer's yeast is heterogeneous compared to freshly propagated yeast which have a more uniform distribution of glycogen. Analysis of the distribution of yeast glycogen during fermentation indicates that a fraction of yeast cells do not dissimilate glycogen. Therefore, conventional analysis of the mean glycogen content of yeast used to inoculate fermentations is of limited use, unless information regarding the proportion of cells which utilize glycogen is known. Analysis of the distribution of glycogen within a yeast population can serve as a useful indicator of yeast quality.
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Affiliation(s)
- G Cahill
- Guinness Research & Development, St James's Gate, Dublin, Ireland
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Pons MN, Vivier H. Biomass quantification by image analysis. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 1999; 66:133-84. [PMID: 10592529 DOI: 10.1007/3-540-48773-5_5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Microbiologists have always rely on microscopy to examine microorganisms. When microscopy, either optical or electron-based, is coupled to quantitative image analysis, the spectrum of potential applications is widened: counting, sizing, shape characterization, physiology assessment, analysis of visual texture, motility studies are now easily available for obtaining information on biomass. In this chapter the main tools used for cell visualization as well as the basic steps of image treatment are presented. General shape descriptors can be used to characterize the cell morphology, but special descriptors have been defined for filamentous microorganisms. Physiology assessment is often based on the use of fluorescent dyes. The quantitative analysis of visual texture is still limited in bioengineering but the characterization of the surface of microbial colonies may open new prospects, especially for cultures on solid substrates. In many occasions, the number of parameters extracted from images is so large that data-mining tools, such as Principal Components Analysis, are useful for summarizing the key pieces of information.
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Affiliation(s)
- M N Pons
- Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC-INPL, Nancy, France.
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Park EY, Koike Y, Higashiyama K, Fujikawa S, Okabe M. Effect of nitrogen source on mycelial morphology and arachidonic acid production in cultures of mortierella alpina. J Biosci Bioeng 1999; 88:61-7. [PMID: 16232575 DOI: 10.1016/s1389-1723(99)80177-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/1998] [Accepted: 04/14/1999] [Indexed: 10/18/2022]
Abstract
The effects of nitrogen source on arachidonic acid (AA) production and morphological changes during the culture of Mortierella alpina were investigated using an image analysis system. When yeast extract, gluten meal, or corn steep liquor was used, a circular pellet morphology was obtained. However, when Pharmamedia, fish meal, or soybean meal was used, M. alpina formed radial filamentous mycelia. The radial filamentous area in the case of soybean meal was 75% of the total mycelial area. In a jar fermentor culture, M. alpina morphology varied with the cultivation period: (i) at 0-6 h culture, the inoculated pellet-like mycelia were adapted to the new environment, (ii) at 6 h-1 d culture, filamentous mycelia grew exponentially which yielded a feather-like morphology, (iii) at 1-2 d culture, the filamentous mycelia became disentangled as a result of the mechanical agitation; consequently, the proportion of filamentous mycelia was increased, (iv) at 2-4 d culture, mycelia showed stationary growth, but the AA concentration increased rapidly, and (v) at 4-6 d culture, hyphae grew thick radially with the AA concentration continuing to increase gradually. In the case of the cultures with feather-like morphology obtained using soybean meal, the AA yield was 0.14 g/g dry cell weight, which was two times higher than that in cultures grown using yeast extract. These results suggest that the feather-like morphology of culture of M. alpina is suitable for AA production.
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Affiliation(s)
- E Y Park
- Laboratory of Biotechnology, Department of Applied Biological Chemistry, Faculty of Agriculture, Shizuoka University, 836 Ohya, Shizuoka 422-8529 Japan
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Cox PW, Paul GC, Thomas CR. Image analysis of the morphology of filamentous micro-organisms. MICROBIOLOGY (READING, ENGLAND) 1998; 144 ( Pt 4):817-827. [PMID: 9579057 DOI: 10.1099/00221287-144-4-817] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- P W Cox
- Centre for Bioprocess Engineering, School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - G C Paul
- Centre for Bioprocess Engineering, School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - C R Thomas
- Centre for Bioprocess Engineering, School of Chemical Engineering, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
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Pons MN, Vivier H. Beyond filamentous species.... ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 1998; 60:61-93. [PMID: 9468801 DOI: 10.1007/bfb0102279] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- M N Pons
- Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC-INPL, Nancy, France
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